What does it mean to say that two different species of organisms are closely related? A. They have the same parents. B. They have a common evolutionary ancestor. C. They live in the same habitat. D. They have the same preferences in diet.

B. They have a common evolutionary ancestor. When we say that two different species of organisms are closely related, it generally means that they share a recent common ancestor in their evolutionary history. This is often determined through genetic analyses, morphological studies, and fossil records.